Re-toothing machine



Mag; 19, 1931.

v. .1. MATHIEU RETOOTHING MACHINE Filed March 5.v 1929 3 Sheets-Sheet l May 19, 1931. v. J. MATHIEU 1,805,831

RETOOTHING MACHINE Fliled March 5, 1929 3 Sheets-Sheet 2 ZZ A" 'I I 2,20 27| Il: IHIHI S www May 19, 1931. y v. J. MATHIEU 1,805,831

RETOO'THING MACHINE Filed March 5, 1929 5 Sheets-Sheet 3 Patented Ma-y r19, 193,1

TENT orFicE- VINCENT J, MATHIEU, F NEW isiaiironii- MASSACHUSETTS, ASSIGNCR To FOLEY SAW Toor. COMPANY, iNconroiaATEnor MINNEAPOLIS, MiNNNsoTA, A coRPonATroN l oF MINNESOTA Appiicvatiqn mea Maren 5,

My invention has formits objectto provide asimple and highly v:efficient ret-oothing ma# chine intended for generar-l use, but especially well adaptedfor use in retoothing old hand Saws, whereby new-teethr areformed' on a saw onthe predetermined line independent of 'the' old teeth on the saw, and in Whichthe old teeth arel removed fromthe saw by the very act of forming the newteeth.

The above end, generally Stated, the-invention consists of the novel devices and combi;

nations of 4devices hereinafterv described and line 3 3 of Fig. l, e y

l Fig. l is a View principallyin right Vside elevation with some partssectioned 'one the line 4 4 of Fig. 1; l

Fig. 5 isfa view partlyin-elevation'and partly in section takenY onthe line Lof Figlgand f Fig.y 6` is a perspective View of the carrier bar guides, andv gauge removed` from the machine. 1

rThe numeral 7 .indicates a framerigidly but detachably secured to a rectangularbase 8, bolted to a bench Aland which frame'7 at its base isrecessedto form a'throat. `9 between said frame 'andba'sej A` vertical re-V movable ram 10 .that'is square in cross-Section is slidably mounted in a channel shaped'seat` inthe face of the frame 7 and heldin position by a yface plate 11` detachably Secured by screws to said frame.

' Apair of tooth formingdies 12 13am vremovably mounted inthe lowerendf'of the ram 10 and in the base'8 respectively. The die 12, which is removable,'isy inethe form of a punchthatis V shaped incross'r-sectiomand the die 13, which is xed, isinthe forni of a' i Y RE-TooTHiNGfMAoHiNE ing its punching action. The removable die i 12 engages ,the lower end of thefrain 10 as a base of resistance duringy its punching 4"action Y' and is provided with a shank 14;` 'which ez/rtends into a herein said ram and rigidly but detachably held therein'by a setI screw f 16. The block 15is removably mountedlin a .cylindrical seat in thek top of the base r8 and' rests on a shoulder 17.k It will bek noted that the bottom of the seat within the shoull der 17 is open and leads` to anescaped pas#` sageway B in theYV bench ,Afory the, escape block 15 extends above the top of thebase 8y and affords a saw support 19 for that portion of a Saw being acted on by `the'dies'12 Vand 13 during the formation'of a tooth` thereon.V

' Acain 20 is provided fork depressing'the ram 10 to cause'the die 12 vto engage a sawion the support 19,. and 'cut yor'punch artfooth therein with. the cooperation of the fixed die B5 of pieces of metal punched ork cut from a e saw during the toothing thereof. iiset'sc'revvr` v18 is provided for holding: the die 13 inthe seat inthe base 8. The'upper end 'ofthe' f 13.V Thisv cam 2() is loosely and turnably mounted on a'hor-izontally 'pivoted pin 21 s which', extends transversely of the machine and secured at its ends in apair of Vlaterally e i spaced bearing' lugs 22v on the; 1i`ppei'-`.end of the frame 7 and which. lugs hold thiscam v20 against axiahinovem'ent on the pinl2l.- .y

The`camk20 is operated by'a hand lever 23,'

with which said cam V'is integrally formed. l' Y Whenhthe cam 2Q is ininoperative position `the'lever 23 projects horizontally rearward from the machine wherethe sameis outiof 'the way. A forward swinging movement of the lever 23 will" impart a downward move# VV ment to the cam 20 tor depress the ram v10'y and cause the die12`to engage ajsawjonthe support 19 and cut or punch a toothktherein Y i with the cooperation ofthe dieA 13.

l A coil spring24 resting on a springseat 25 at the bottom of' a recess in the freine? has on its upperend aspring cap v26 which Ven;KV gages a laterally projecting stud: 27A on the` upper end portion of the'rain 10 and'yieldingly holds said ram raised against the cam A stripper 28, in the forni of a lever, is provided for yieldingly holding a saw on the saw support 19 during the retracting movement of the die 12 as the same moves out of y frictional engagement with said saw. This stripper 28 extends horizontally from the front to the rear of the machine at the right of the frame 7, and is intermediately pivoted at 29 to said. frame for vertical swingingthe rear edge of the base 8, and having a deep notch in which the rear end portions of the stripper 28 works. By depressing the rear end of the stripper'28 the forward end thereof may be raised to permit the insertion of a saw between said stripper and saw support 19, or the stripper A28 may he raised for the insertion ofa saw thereunder simply forcing the saw endwise between the support 19 and said stripper.

' A secondary saw support 33 is mounted on eachside of the sawsu-pport 19 for horizontall adjustment. These saw supports 33 are in the same horizontal plane as the saw support 19 for supporting a saw in a horizontal plane transversely of the machine with'its toothed edge portion extending into the throat 9. Said sawvsupports 33 have'flat depending bodies 34 that slidahlyengage the'sides of the base 8 and are secured thereto loy Iset `screws 35, which extend through horizontal slots 36 in said bodies, and have screw threaded engagement with the base 8. These screws 35^and slots 36 permit adjustment of the saw supports 33, either toward the front of they machine or the rear thereof.

vA pair of edgewise spaced forwardly projecting horizontal supports 37, in the form of Hat bars, extend transversely of the machine, 4

one on each side of the die 13, and have their rear end portions supported on the tops of bearing blocks 38and rigidly secured' there to. These blocks 38 are integrally formed with the top of theloase 8 and-hold said supports in a plane above the top of the saw sup? ports 19. and 33. The supports 37 have longi-V tudinally extended slots 39, and are unsupportedabove thehase 8 except hy the blocks.

38, which are rearward of the throat 9 in the frame 7. Suspended from the supports 37 is a. saw carrier and guide for holding a handA saw transversely of the machine withits toothed edge portion Vextending into the throat 9 and loosely resting on the saw supports 19 and 33 for universal movements in the plane of said saw. This saw carrier and guide includes a pair of carrier bar guides, and a carrier loar 41, and which guides are provided with upstanding studs 42 which eX- tend upward through the slots 39 in the supports 37, and having wing nuts 43 applied thereto. These wing nuts 43 rest on the tops ofthe-supports 37, and hold the guides 40 by the studs 42 suspended under lsaid supports. By adjusting the wing nuts on'the studs 42, the 4guides 40 may loe frictionally clamped onto the supports 37 and held where set in different adjustments, longitudinally of said supports, orin different rotated adjustments above the axis vofthe studs 42. The carrier bar 41 is mounted forendwise'sliding -movement in channel-shaped seats 44 inthe undersides of ltheguides 40. Onthe krear 'edgeof the carrier har 41,-is a row'of longitudinally spaced ratchet teeth with whicha` dog -59 for imparting tooth spacing movement to cooperate said har, as will presently appear'.

. The saw vcarrier and guide further includes a plurality'of vsaw supports 46, as shown three, in the fornil ofilat loars, 'which extend transversely and forward ofthe carrier bar 41 at longitudinally spaced points with their rearend portions underlying said `bar,and

rigidly'v secured thereto. l These supports 46 are entirely freefand unsupported except for their attachment tothecarrier har 41, and have longitudinally extended'slots 47. Cooperating A"with each support 46 for holding asawX; atv its baclris aclamp .48 adjustably attached tol said support by a nut equipped bolt 49, which extendsthrough ain Vaperat-ure in said clamp, and the slot 47 in Vsaid support. The clamps 48 are in the .formzof flat plates, the front and rear edge portions of whichfare bent .laterally toward the supports 46. Said clamps 48 at their front edge engage the underside of said supports as bases of resistance, and their rear edges engage the underside of the saw and clamp the same onto the supports 46. The ,bolts 49-are held in the clamps 48 fromturningin respect thereto, and the nuts therefor rest on Athe upper faces of thesupports 46.

` To mount the saw X in the sawvca-rrier and guide, said carrier and guide is first removed from the Amachine and placed on said saw with .the carrier har 41 ,parallel to a line on which newfteeth are to be formed inthe saw, and which line is sufliciently inward from :the old teeth so .that they will be removed fromr the saw.simultaneouslyvwith the forming of the new teeth thereon. With thesawX thus positioned, the clamps 48 are'adjusted on the saw supports 37 until'stopped .hyv the engagement of ltheir bolts 49 with the hack of said sawand then said .nutsaretightened to set theclamps 48 and` frictiona'llyclamped the saw X onto the supports 46. After thesawinto the seats 44with the tooth edgevv ofthe 'f teeth.

saw positioned to pass over the saw supports 19 and 33 and under the stripper 28. J

When the saw X is in the machine, it is in a horizontal position withits back 'supported by the clamps 48," and at` its toothed edge portion supported on the supports 19 and 33, and on which Vsupports the saw rests with freedom for universal movements in its own plane. .With the saw kX-'thus held in the machine, thesawfcarrier and guide is adjusted by sliding the guides 40 longitudinally on the supports 37 toposition ythe tooth edge .portionof .the saw X betweenthe diesl 12 and 13. The line on which the new teeth are to be formed will, of course, be parallel to thel carrier bar 41, and which line will be inward of the deepest teeth in said bar so that there will be sufficient stock tojform thenew The saw X may also be angularly adjusted with respect to the dies 12 and 13 to cause said dies to form teeth with the desired pitch. By tightening the wing nuts 43 on the studs 42, the guides will be frictionally clampedy on the supports 37 and rigidly held where set to guide the carrier bar 41 and hence the saw X for straight line movement past Vthe dies 12 and 13. A feed device for impartingtooth spacing movement to the carrier bar 41 comprises a lever 50 loosely mounted on a pivot bolt 51 on the underside ofthe right hand support 37 and has on its upper end a reduced screw-threaded stud 52 which eX- tends kupward through the slot 39 in said support, and has applied thereto a wing nut 53. Obviously by tightening the wing nut 53 which rests on the upper face of the righty hand support 37, the pivot bolt 51 may be frictionally clamped on the underside of said support and rigidly held where set. The lever is held againstfaxial movement on the bolt 51 by the right hand support 37, and the headed lower end of said bolt.

By reference to Fig. 1, it will be noted that the lever 50 projects horizontally and later'- ally outward from the right-hand support37 and at ysubstantially right angles thereto. A stop lug 54, on the rear edge of the lever 50, is arranged to engage the outer longitudinal edge of the right-hand support 37 and limits the rearward or return movement of the lever 50. The forward or operative movement of the lever 50 is limited by an adjustable stop in the form of a thumb-screw 56 having screw-threaded engagement with a lug 57 on, the front longitudinal edge ofsaid lever and arranged to impinge against the support 37 as a stop. A lock nut 58 on the screw 57 is provided for holding said screw 'where set.

Obviously by adjusting the thumb screw 56, the stroke of the lever 50 may be varied at will.l A coilspring anchored to the righthand block 38fand attached to the leverv 50 yieldingly holds said lever in an inoperative position. Cooperating j with thel ratchet teeth 45 is a dog 59 pivotedy to the lever 50r and arranged to( impart tooth spacing movement to the carrier bar and. under the action of the lever 50. A coilspring 60,.an`chored to the lever 50 and attachedto` a rearv eX- tension 61 on the dog 59, yieldingly holds said dog in engagement with the ratchet` teeth 45, and `permits said 'dogto ride over said ratchetteeth during therearward or inoperative movement Vof theV lever 50. The feed device y50-'51 is attached to the; righthand guide and by a link 62, vone end 'of which is pivoted to the stud 42 of said guide, and theother end thereof is pivoted to the stud 52-of.said feed device. J

' Forward movement ofthe"leverj50` until stopped bythefscrew 56 will lcausethe dog 59 to engage one of theratchet teeth45 Vand impart a tooth spacing movement to the car.-

rier bar' 41 and move the saw. Xlongitudinally betweenthe dies 12 and 13 for a tooth to u n v be formed therein-bysaid. dies.7 Thenumso i ber'of teeth per inchto beformed inthe saw X may bevaried at vwillby adjusting the stop. 56 to change' the'stroke'ofthe lever 50-V i and hence the movementof thedog 59.

' As .previously stated,fthe pitch of .theteeth may be varied at will by adjusting the guides 40 in the .supports 37 to vary the anglesof the saw X in respect to the dies12 and v13. The

link 62 always keeps the feeding device 50`59 i -V v inadefinite relation to the carrier bar 41 in all ofthe various different longitudinal adj ustments `of the4 right-hand guide 40. onrthe respective support'37..V w JA gauge. 63 is provided for use .in seating the carrier bar 41 in different angular'positi-onsin respect to the dies 12 and 13 to cause saiddies toform teeth with a predetermined pitch.L This gauge 63 also performs another important function to wit it keeps the guides 40, in all of their `dierent adjustments with the channeled-seats44 therein aligned sothat the carrier bar 41 may be readily inserted thereinby endwise movementwhen mounting theV saw X in Athe machine. -Asf shown the gauge 63is'in the form of around r-cd which extendsthrough bores in the-guides 40, andv Vwhich rod lis parallel tothe channel-seats 44.

- 4The lright-hand,guide/40 and the left-hand l portion of said gauge is free for longitudinal. sliding movement in theleft-hand guide 40.

Formed in thesfree end portion ofthe gauge 63 are two longitudinally spaced notches/64, ar-

ranged to'be brought in alignment with-the' i l-eft-handiedge portion/ofthe left-hand guide 40y as apositioning surface. :The'right-hand notch 64,' when in. alignment with f the '1eft.

hand guide 40,positions the carrier and guide,

and hence the saw X t-oy have vformed therein by the dies12 and 13 teeth for yarip saw,"and when the left-hand notch 64 is brought into alignment with said guide, the saw is positioned vto causethe dies l2 and 13 to form teeth therein for cross-cut saw. A set screw 65 in the left-hand guide 40 is arranged to impinlge against the gauge 63, and hold the same where set in said guide.

From the above description, it is evident that a saw to be ret-oothed, when mounted in the saw carrier and guide,is guided thereby for straight line movement and tooth spacing movement, which movements are entirely independent of the old teethon the saw. The carrier bar 41 determines a line parallel thereto on which new teeth are to be formed, and the dies 12 and 13 in forming new teeth simultaneously remove the old teeth. It will thus be seen thatby the very act of forming new teeth, the old teeth are removed and the new teeth formed on a line determined by the guide bar 4lpwithout first having to remove the old teeth and shaping the respective edge of the saw to a straight edge. After a saw is mounted in the machine and properly adjusted, the operator byl alternately operating the levers 23 and 50,1irstby means of the lever 23 causes the dies L12 and y13 to 'formy new teeth, yand thereafter by means of the lever imparts a tooth spacing movementto the saw to position the same for the next teeth to be formed by l the dies. By these simple movements, a saw is retoothed on-a predetermined line with the teeth accurately spaced and formed with the proper or desired pitch.

What I claim is:

l. In a saw re-toothing machine, the combination with a tooth forming device including a movable die'and means for operating the same, of a saw carrier, means for guiding the carrier for straight line movement past the die, means for imparting a step by step tooth spacing movement to the saw and carrier,and

a clamping device for holding a saw on the carrier With the line, on which teeth are to be formed, parallel to the line of movement'of the carrier, said carrier being adjustable in the plane of the saw and aboutl the line of movement of the die to vary the pitch of the back edges of the teeth formedv by the die.

2. The structure defined in claim l in which the carrier is4 further adjustable in the plane of the saw toward or from the die to vary the distance the teeth are cut from the carrier.

3. In a saw re'-toothing machine, the combination with a base, of a tooth forming device on the baseincluding a movable die and means for operating the-same, a pair of supports on the base spaced one on each side of the die, a pair 'of saw carrier guides mounted on the supports for independent adjustment in a plane perpendicular to the movement of the die and oifset from said die, said carrier guides also being mounted for turning movement about axis perpendicular to said plane, a saw carrier mounted inA said guides for straight line movement past the die, means for impartable to vary its operative length and position said guides in different adjustments to vary the pitch of the teeth formed by the die.

In testimony whereof I aiiiX my signature.

VINCENT J.r MATHIEU.

Yso

f los Vll() 

